#!/usr/bin/python

""" wrapper around a userdefined script which can be called in pydar """

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Library General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
# Copyright 2004 Dries Verachtert

import sys
from log4py import Logger


class CallableScript:
    def __init__(self, modulePath, functionName):
        self.__cat = Logger().get_instance(self)
        self.__modulePath = modulePath
        self.__functionName = functionName
        self.reloadMethod()
        
    def reloadMethod(self):
        self.__myMethod = None
        # immediately try to create the callable object
        sys.path.append(".")
        # @todo: add some nice exception catching so we can show decent errormessages
        myModule = __import__(self.__modulePath)
        myMethod = getattr(myModule,self.__functionName)
        if not callable(myMethod):
            raise Exception("method " + self.__functionName + " in module " + self.__modulePath + " is not callable!")
        self.__myMethod = myMethod
        
    def _getMethod(self):
        return self.__myMethod